Marines from Combat Logistics Battalion 451, Combat Logistics Regiment 45, 4th Marine Logistics Group, train during an exercise that simulates a supply drop off/pick up during Integrated Training Exercise 4-14 aboard Marine Corps Air Ground Combat Center Twentynine Palms, California, June 14, 2014. The purpose of the exercise is familiarizing the Marines with supply drops and pick-ups in areas where it might be too dangerous or the terrain is not suited for the helicopter to land. ITX 4-14 is the largest annual U.S. Marine Corps Reserve training exercise, which helps refine skills necessary to seamlessly integrate with active duty counterparts as well as operate as a complete Marine Air-Ground Task Force. (U.S. Marine photo by Sgt. Adwin Esters/Released)